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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc58b2d2d572a57364a2b04dff8d0b8c8f86dc3204d7f48b23a46ed97b37d432' 
  AND token = 'eqlkWeYBUYapSfDHzGGUCVC8GWVE6mzn2BlR7BkeuHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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