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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86174d0aa95f290a0cf9aa96f7fefe253b70c3f2785f3d3aa711288d6c1d29b6' 
  AND token = 'wCX44im3jpSWmJcumyCVOV62SUs2dCNd5ySliHfkuos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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