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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1938aefae91ad1303de0968ab0b1ae3071f06309a59adbcd1872478e1ef4dec5' 
  AND token = 'PdSrHOrlgJT+PkpP2KVwNrMpshTq3hplJx7IskA9/RM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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