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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a022d6d431652e5de7c728abc8da08a7f3a17150e6858fc2aa8ac19134b703c9' 
  AND token = 'KDMsA/kNUF++s+3rwHR3N9c853C/aVwtjOX9Gacz7G8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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