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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0b7eb29038599484a2f63969f72c4b7538340d36c75fcdbccd791a39166bd69' 
  AND token = 'r/TlAI4Hj6L2utVTkJmUYMgNf4pQT2I38geztiJpMRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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