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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9f8b611deaaf131272930a61433e66f0ab87c2fedee813292fc2563c7bc137e' 
  AND token = 'cRc6CsIBBuvSp8W2/ShNTAH2sOiMGQoE+AMkj5iF3Wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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