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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcb574b9b9c9f4176d5162e643cd22c7920fd1841877756147ddf30bb7a1c3d0' 
  AND token = 'e8X8WqY/9IE//T9iex5FNJCA2JqLDfR3KDngXAlO+9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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