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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6952fb525becde61ddbc3e004034647fd5bac06ab0b46ad07dcaee5f7098d54' 
  AND token = 'v95VLCGQkZoTYBucmvOzc0gWCTW9WwjipxNQ/7LJv+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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