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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c52e92e122c00d7c503b0e1f1a39338575b197f4223ce4124cc18bd80163ea7d' 
  AND token = 'yz+C5Y3BSie3/dtbefJ+UfIk6cNNlNK0S8JXS/lGGRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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