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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1ec7aa2ca5d7742c0aa03adc141305c8d35a77c8643abfa23c3e4be51b7ffe1' 
  AND token = 'DGKNJuqDvkPVNst9MxZKbihzZmy1kSLvEmKnrLKS8sA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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