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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e507a1e22d170a180056d317c2ab3df89d95eeeef0c65d010d07ca48cfb696a2' 
  AND token = '/GnoU/b5dw4YAH1XSl+oLFn3fOvefV7KKvdyptHllg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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