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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a19dc7cb0f3a309197ead421675ac64c26d7e38e6c74166fd7d954cb0e56096c' 
  AND token = 'XcHm/auYXOh43TpOaz5kM7bJ+R/0kemSKuF+KeSFNZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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