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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ac3368845517b16c016e605a9042d53c3af6a825eebb533494b040a4848c10f' 
  AND token = 'QUJt9No7UgvjWKn8ClS692mgAsmhLfI2eIXWWR943K8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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