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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa911f9dd33c02df443420b10a2b9ac06e16dbd2654add025627bdd6a2efdc37' 
  AND token = 'E2aCjz0JlVqcqRpL7J+AKoykZC3vMx82khqVRcDoorQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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