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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e9e5f7c3a950ea00e8452f81442dcaccf091ad1134febbeb0c30bd0f6b5f9c5' 
  AND token = 'i2n2XoHyB+Ie5JuCYN2iap4rk4Fspjvly4BYw7wKFbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}