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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e62cacf658576a049ae64ce0a4ea19b5ea03cdae7e41fdb5f2214c56a1f31b5e' 
  AND token = '0cdQ2FGEcrCL1mk7nvR+aV7vhmldHmkv+q4dcMQqkOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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