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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '270ebdfd24ffe80526a26d6073a8f1e6fb6eff3590deef57e8eae4916c1ad242' 
  AND token = 'es0Xq8RITdGUk09J3USpblX7F+PWmN1kTwnsVuSo1QA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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