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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '510384a083e88937bf2ffd1575d6433dfa8051b1a8b6acb3070ee3c129b857bf' 
  AND token = 'byJRY3Ia3rfJKnITTvemyC0Hzt3rhghTLeSzWsE3+cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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