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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '355a30a965e116294f6f3d8af86a02e0487b97ed29cf1eecd4e1a11bdc49038c' 
  AND token = 'i+lSJleV3a8ATslsWfMO+0s1r/3f8IqC4knJReS31H0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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