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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f03f7827052ddefd460d6e642ccea1db115b708cf49db0e6b1b103c69577ed8e' 
  AND token = 'bqJsztf/k5QhI/JVAO1e5rifQK8O02whtiUmsRhZ6B0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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