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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8a536e35d66edf588530ad9e9385ec9c1b9d5f1ed57886c4e95f698058b27d5' 
  AND token = 'cXevdHhwti0Kma5/Jcw+r/t/Mfn7D6bUMNM2V8/qMMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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