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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfb39cbf93b1d3a31869f269c0fb9acca0df0e8f985029b0116e02ec70067092' 
  AND token = 'i3IlZG+u+29mNVXGNxczKPNAJGcVFCQN+Jm6M644S+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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