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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0ea314d0fdfbf9f73dd5a23a2d98bd76424aabf61e9c758bf7a39751619ee0a' 
  AND token = 'zm3oAqltyfz6n4ZbeF/vQECwmMzhMdfFnrLGNclow0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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