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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71a5c6b7e45e3052711384591b8eb25fe8aa09df75a0fed27c2e85bdce97e2fb' 
  AND token = '70Mlshx8CtHQOD9GrnA9wqs4pdl5dwZWyroOO0jO85g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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