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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '631be273a50afb5515f142f5b792a0a4b11b6a61c3db93a76979f40f3fe88277' 
  AND token = 'pZVFbQ66opt7sF4gh3q/ur5yJTMteLfO6Cylx1qePtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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