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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85d5e0a32cee11e8b7e030311ada69c4f01c44593a0f0744c9f24af3f3487d86' 
  AND token = '1fYF5chIpqZWQqLUhE1srZRKEQlMGHecwGEgi4HZpis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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