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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef4e8d5d64b885d52ea956f9e26c2106d683fe12ecdb445faa10113a9b17c6f6' 
  AND token = 'v/VJGfYlI2HVoS8jJAMYdfj4Y4b6stflLlZfawmtQr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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