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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eefa3b21b54a5e8b99e2d476dd2510398c285e87b17f07f1c3e5b90cd8e5ded' 
  AND token = 'fsJnD1lvV3Z+lqAX0j4kCDoAatFcwRgh4sbH5l1hx2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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