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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b7122edd118c9715abae566566a8f0b8068d425464ed8f383d57660b2315f5e' 
  AND token = 'Ky0AF0TnwrVjYQ2Aj/4HfJd+EsVnxh0kpugF5VcpCiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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