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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de9332771ee05b2428e4df89ff187cda5ef7071da5d99e94dd5b8b0880a52cbd' 
  AND token = 'sql9Cn4vXA73kjF84ACIntdJCStqOUPgaP/nkqmE608=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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