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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edad47b4e45ef0095d7e8b2003ede11efd64797a84faabf3bfe8f7ea27471807' 
  AND token = 'FSIC00a8OAzo9vONvtdEO/tN0HwXqnXH2rjpia7muOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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