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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1239a7ec60b50bda157705286a1399f3703edb8e3fdb87e9704670b9f132c9b' 
  AND token = 'H2lbV7wno4LtfG/BSBwK1jZJzJxaP3y00cAXLaS+c4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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