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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a6fd640e81195dd075dde8d7faed63e4e1a3a9adbbe01d35544e91a55aaaba6' 
  AND token = 'CA9dKP4LIC2kGDP6TK0u2Mtg19pfqLeswYzf9MViW28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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