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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bfdb0ebde2cf3bb0196ff50462ef3b9f9179de84fae3994c75b9529f0c17bc4' 
  AND token = 'HJHHIb5e+iOEF/hUl+uTwXSnYFCIbeAnhQ3I1j4t9nU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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